public static AudioFormatError GetFormatInfo(ref AudioStreamBasicDescription format)
{
unsafe {
var size = sizeof(AudioStreamBasicDescription);
return(AudioFormatPropertyNative.AudioFormatGetProperty(AudioFormatProperty.FormatInfo, 0, IntPtr.Zero, ref size, ref format));
}
}
public static AudioStreamBasicDescription[] GetAvailableStreamDescriptions(AudioFileType fileType, AudioFormatType formatType)
{
AudioFileTypeAndFormatID input;
input.FileType = fileType;
input.FormatType = formatType;
uint size;
if (AudioFileGetGlobalInfoSize(AudioFileGlobalProperty.AvailableStreamDescriptionsForFormat, (uint)sizeof(AudioFileTypeAndFormatID), ref input, out size) != 0)
{
return(null);
}
var data = new AudioStreamBasicDescription[size / sizeof(AudioStreamBasicDescription)];
fixed(AudioStreamBasicDescription *ptr = data)
{
var res = AudioFileGetGlobalInfo(AudioFileGlobalProperty.AvailableStreamDescriptionsForFormat, (uint)sizeof(AudioFileTypeAndFormatID), ref input, ref size, ptr);
if (res != 0)
{
return(null);
}
return(data);
}
}
public static AudioConverter Create(AudioStreamBasicDescription sourceFormat, AudioStreamBasicDescription destinationFormat, out AudioConverterError error)
{
IntPtr ptr = new IntPtr();
error = AudioConverterNew(ref sourceFormat, ref destinationFormat, ref ptr);
if (error != AudioConverterError.None)
{
return(null);
}
return(new AudioConverter(ptr, true));
}
public static AudioStreamBasicDescription CreateLinearPCM(double sampleRate = 44100, uint channelsPerFrame = 2, uint bitsPerChannel = 16, bool bigEndian = false)
{
var desc = new AudioStreamBasicDescription (AudioFormatType.LinearPCM);
desc.SampleRate = sampleRate;
desc.ChannelsPerFrame = (int) channelsPerFrame;
desc.BitsPerChannel = (int) bitsPerChannel;
desc.BytesPerPacket = desc.BytesPerFrame = (int) channelsPerFrame * sizeof (Int16);
desc.FramesPerPacket = 1;
desc.FormatFlags = AudioFormatFlags.IsSignedInteger | AudioFormatFlags.IsPacked;
if (bigEndian)
desc.FormatFlags |= AudioFormatFlags.IsBigEndian;
return desc;
}
public static unsafe int[] GetAvailableEncodeNumberChannels(AudioStreamBasicDescription format)
{
uint size;
if (AudioFormatPropertyNative.AudioFormatGetPropertyInfo (AudioFormatProperty.AvailableEncodeNumberChannels, sizeof (AudioStreamBasicDescription), ref format, out size) != 0)
return null;
var data = new int[size / sizeof (int)];
fixed (int* ptr = data) {
var res = AudioFormatPropertyNative.AudioFormatGetProperty (AudioFormatProperty.AvailableEncodeNumberChannels, sizeof (AudioStreamBasicDescription), ref format, ref size, ptr);
if (res != 0)
return null;
return data;
}
}
public static AudioConverter Create(AudioStreamBasicDescription sourceFormat, AudioStreamBasicDescription destinationFormat, AudioClassDescription[] descriptions)
{
if (descriptions == null)
{
throw new ArgumentNullException("descriptions");
}
IntPtr ptr = new IntPtr();
var res = AudioConverterNewSpecific(ref sourceFormat, ref destinationFormat, descriptions.Length, ref descriptions, ref ptr);
if (res != AudioConverterError.None)
{
return(null);
}
return(new AudioConverter(ptr, true));
}
public unsafe static AudioChannelLayoutTag[] GetAvailableEncodeChannelLayoutTags(AudioStreamBasicDescription format)
{
var type_size = sizeof(AudioStreamBasicDescription);
uint size;
if (AudioFormatPropertyNative.AudioFormatGetPropertyInfo(AudioFormatProperty.AvailableEncodeChannelLayoutTags, type_size, ref format, out size) != 0)
{
return(null);
}
var data = new AudioChannelLayoutTag[size / sizeof(AudioChannelLayoutTag)];
fixed(AudioChannelLayoutTag *ptr = data)
{
var res = AudioFormatPropertyNative.AudioFormatGetProperty(AudioFormatProperty.AvailableEncodeChannelLayoutTags, type_size, ref format, ref size, (int *)ptr);
if (res != 0)
{
return(null);
}
return(data);
}
}
static extern AudioConverterError AudioConverterNewSpecific(ref AudioStreamBasicDescription inSourceFormat, ref AudioStreamBasicDescription inDestinationFormat,
int inNumberClassDescriptions, ref AudioClassDescription[] inClassDescriptions, ref IntPtr outAudioConverter);
static extern AudioConverterError AudioConverterNew(ref AudioStreamBasicDescription inSourceFormat, ref AudioStreamBasicDescription inDestinationFormat, ref IntPtr outAudioConverter);
public static AudioConverter Create(AudioStreamBasicDescription sourceFormat, AudioStreamBasicDescription destinationFormat)
{
AudioConverterError res;
return(Create(sourceFormat, destinationFormat, out res));
}